The BA.2 sub-type of the Omicron COVID variant, which spreads faster than the original form of Omicron, is becoming more prevalent in the U.S.
After the mixture of the highly transmissible Omicron and Delta variants was reported last week, experts have told Newsweek why it is too early to be concerned.
Scientists do not know what effect these microbes would have if they were released into the current ecosystem.
Worldwide, BA.1 has been the most common Omicron lineage but the proportion of reported BA.2 cases has been increasing relative to it in recent weeks.
As the Omicron sub-variant (first discovered in late 2021) continues to spread, here's what we know about its characteristics, including vaccine effectiveness.
The federal health agency does not always publish COVID data it receives from states, but it is "in a tight spot," one expert told Newsweek.
The Omicron sub-type is thought to be more transmissible than the more common BA.1 type, although other characteristics are still unclear.
The U.S. philanthropist, known for trying to provide some of the world's poorest people with high-quality healthcare, died on Monday.
Dozens of people in Denmark have caught BA.2 within months of catching BA.1—meaning they caught Omicron twice.
The WHO is monitoring the BA.2 sub-variant as it accounts for a growing number of COVID infections.
Based on lab studies, scientists have said the Omicron strain should be given variant of concern status by health officials.
Viruses are "supremely adapted" to survive, so they could be around long after human beings.
Epidemiologist Stephen Morse warned Newsweek against "prematurely declaring victory" against COVID, as states let mask mandates expire amid a drop in cases.
The Omicron sub-type has yet to become dominant in the U.S. though cases are on the increase.
The Omicron sub-type continues to spread around the country, but it's far from being dominant in the U.S. just yet, data suggests.
As several states announce the rolling back of mask mandates amid optimistic COVID case data, some experts have warned against complacency.
The Department of Health and Human Services is offering grants aimed at reducing harm from substance abuse.
Scientists say that Omicron appears to survive better on surfaces than past COVID variant, and this may partly explain why it has spread so quickly around the world.
Several states have announced mask requirements will be phased out as U.S. coronavirus cases fall, although deaths remain on the high side.
One athlete shared a photo of a plain-pasta meal that had been "breakfast, lunch and dinner for five days."
The Pacific island nation, which had mostly kept the disease at bay, was placed on lockdown Wednesday.
The CDC wants to raise awareness of the risks of rabies after three people died from the disease between September and November 2021.
Chinese researchers say NeoCoV, a relative of the MERS virus, could potentially spread to humans one day—but other experts say it's too early to be alarmed.
Data increasingly suggests the Omicron sub-variant is more transmissible than its BA.1 sibling.
Booster shots were at least as effective against the new form of Omicron compared with the original, according to early data.
A study found that people who drank red wine appeared to be less likely to catch COVID than people who drank other types of alcohol or non-drinkers.
The Omicron sub-type has been given the "stealth" moniker despite the fact that it will still give a positive COVID test result—here's why.
The Omicron subtype has caused concern as it may be better at spreading than the original form of the variant, but little is currently known about it.
The "son-of-Omicron" could possibly be faster-spreading than the original type, but there is no evidence yet that it causes more severe disease.
Early data suggests that the BA.2 Omicron sub-variant, nicknamed "stealth Omicron," may have an increased growth rate compared to the variant's dominant form.